I'd pick better health before better breath! Keto is amazing, I'm never hungry - you not only live longer, because it's less harmful, but you save so much time and energy having to think about food and eating it! I eat 1-2 times a day, ideally, I want to eat once a day and I can, but for social reasons, I eat twice most of the time. Eating once at night has a name - Warrior Diet [0].
[0]: https://en.wikipedia.org/wiki/Warrior_diet